Fluid-brake mechanism.



No. 710,876. Patented-Oct. 7, I902 J. F. MALLl-NCKRODT. FLUID BRAKE MECHANISM.

(Application filed Jun. 13, 1902.) {No Model.)

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ilrurnn STATES ATENT OFFICE.

JOHN F. MALLINCKRODT, OF DENVER, COLORADO, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO THE SAUVAGE DUPLEX AIR BRAKE COM- PANY, OF DENVER, COLORADO.

FLUID-BRAKE MECHANISM.

DBECIFICATION forming part of Letters Patent No. 710,87 6, dated October 7, 1902.

Application filed January 13, 1902. Serial No. 89,572. (No model.)

To (11/ whom it 717,103, concern.-

Be it known that I, JOHN F. MALLINC- KRODT, a resident of Denver, in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Fluid-Brake Mechanism; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which IO it appertains to make and use the same.

Myinvention relates to an improvement in fluid-brake mechanism, the object of the invention being to provide improved mechanism for governing the fluid-pressure in the brake-cylinders.

\Vith this object in view the invention consists in certain novel features of construction and combinations and arrangements of parts, as will be more fully hereinafter described,

and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view illustrating my improvements attached to a car, and Fig. 2 is an enlarged view in section illustrating the governor.

1 represents the spring supported carbody, and 2 the sand-board, which is rela tively stationary. Fulcrunied to the under side of the car-body l is a bell-crank lever 3, to one arm of which a link or rod at is 0 connected and secured at its lower end to the sand-board. A rod or link 5 connects the other member of lever 3 with one member of a similar bell-crank lever 6, fulcrumed to the car-body. The other member of le- 5 ver (3 is connected to stem 7, which passes through an opening in an externallythreaded sleeve 8, the lower end of which latternormally engages a flange 9, fast on stem 7. This sleeve is screwed into a nut 9 in the upper end of a cylinder 13, and the flange 0 bears against the upper end of a coiled spring 10, whose lower end bears upon a piston 11, fast on the piston-rod 12 of my improvedgovernor-valve. The piston 11 is mounted in the 5 cylinder 13, above referred to, and the latter and all the working parts of the governor are inclosed in a block or casing 14, supported in front of the brake-cylinder 15 and in the passage of the fluid from the triple valve. From the triple valve the fluid passes into a duct to 16, and the latter is connected with a similar duct 17 above the same and leading to the brake-cylinder by a ring 18, supported directly below the cylinder 13, forming a valveseat, through. which the rod 12 projects, and has secured on said rod below the ring 18 a valve 15), provided with suitable packing 20 to firmly seat against the ring lS'when the valve is raised by the piston. The extreme lower end of rod 12 is made with a circular head 21, mounted in a cylindrical casing 22, secured in place by nut 23'to hold the rod at all times against lateral movement.

The bottom of the cylinder13 is closed, with the exception of an opening 24, through which the piston-rod 12 passes, and this red fits comparatively close in said opening, but not airtight. The bottom of the cylinder 13 serves to retard the entrance of sufficient fluid-pressure into said cylinder to operate the valve until the brake-cylinder shallhave been filled and the pressure therein and in the ducts shall have risen to a certain point, at which time sufficient pressure will have aecumulated in the cylinder 13 through the opening 2% and past the rod 12 to exert enough 11p ward pressure on the piston 11 to close valve 19' and entirely shut off the supply of air or other fluid to the brake-cylinder.

It will be seen that with my improvements So the valve 19 does not begin to close until after a certain pressure is in the brake-cylinder and ducts 16 and 17, and hence the flow of air or other fluid is not retarded by a partial closing of the valve until a sufficient amount of fluid has entered the brake-cylinder, when the valve will be closed by the fluid entering the cylinder 13 around the piston-rod, thus board 2 of the car and adapted to raise or lower the stem 7, according to the weight on the car.

To permit the exhaust of the fluid from the brake-cylinder and the ducts lfi and 17, a spring-pressed valve 25 of the usual construction is provided, normally closing a port 26 between the ducts 16 and 17.

Various slight changes might be resorted to in the general form and arrangement of the several parts described without departing from the spirit and scope of my invention, and hence I would have it understood that I do not wish to limit myself to the precise details set forth, but consider myself at liberty to make such slight changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a fluid-pressure brake system, the combination with a valve interposed between the pressure source and the brake-cylinder to control the passage of pressure from one to the other, of a cylinder, a springpressed piston therein, a rod connecting the piston with said valve and means for retarding the admission of fluid into said cylinder, whereby sufficient pressure will not have accumulated in said cylinder to close the valve until the brake-cylinder shall have become filled.

2. In a fluid-pressure brake system, the combination with a cylinder having an opening in one end, a spring-pressed piston in said cylinder, a piston-rod secured to the piston and projecting through the opening in the end of the cylinder, said opening being of a size relatively to the piston-rod to retard the passage therethrough of fluid, ducts beneath said cylinder and a valve operated by said piston to close the passage through said ducts when a predetermined quantity of fluid squeezes into the cylinder between the opening in the end thereof and the piston-rod.

3. In a fluid-pressure brake system, the combination with a cylinder located in the passage of the fluid to the brake-cylinder,said first-mentioned cylinder having an opening in one end of just sufficient size to permit the movement of a piston-rod, a piston in said cylinder, a rod secured to said piston and projecting through the opening in the end of the cylinder, ducts below the cylinder for the passage of fluid to the brake-cylinder, and

cylinder, a piston-rod secured to said piston 1 and projecting through an opening in one end of the cylinder and practically filling said opening, of a valve operated by said pistonrod to close the fluid-passage when the piston is moved by fluid forcing its way into the cylinder around the piston-rod.

5. In a fluid-brake system, the combination with a cylinder having a spring-pressed piston therein and a mechanism operated by the weight of the car for regulating the tension of said spring, of ducts for the passage of fluid to the brake-cylinder, communicating with one end of said first-mentioned cylinder, a piston-rod secured to said piston and projecting through the end of the cylinder,means for retarding the entrance of fluid into the first-mentioned cylinder, and avalve carried by the piston-rod and adapted to close the passage through the ducts when a sufficient amount of fluid has squeezed into the cylinder around the piston-rod and moved the piston.

6. A governor for fluid-brake systems consisting of a cylinder to be located in the fluidpassage to the brake-cylinder and having a spring-pressed piston therein, a piston-rod secured to the piston and projecting through the end of the cylinder and into the fluidpassage, means for retarding the flow of fluid from said fluid-passage to the first-mentioned cylinder, and a valve operated by said rod to close the passage when sufficient pressure shall have accumulated in the first-mentioned cylinder to move the piston therein.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

JOHN F. MALLINOKRODT.

Witnesses:

ROBERT H. BUCK, GEo. R. SNYDER. 

